swift PickerView

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 let pickerV = UIPickerView(frame:CGRect(x:0,y:250,width:self.view.frame.size.width, height:260));
        //pickerV.backgroundColor = UIColor.brownColor();
        //设置是否显示选中状态
        pickerV.showsSelectionIndicator = true;
        //设置代理
        pickerV.dataSource = self;
        pickerV.delegate = self;
       pickerV.selectRow(0,inComponent:0,animated:true)
        pickerV.selectRow(0,inComponent:1,animated:true)

        self.view.addSubview(pickerV);

遵守2个代理

class ViewController: UIViewController,UIPickerViewDelegate,UIPickerViewDataSource

代理方法

 //返回几个区间
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 2;
    }
    //设置选择框的行数
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if component == 0 {
           return 5

        }else{


            return 9;
        }
    }
    //设置选择框的内容
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return String(row)+"-"+String(component);
    }
    //调整选择框尺寸
    //设置列宽
    func pickerView(_ pickerView: UIPickerView, widthForComponent component: Int) -> CGFloat {
        return 50;
    }

    //设置行高
    func pickerView(_ pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
        return 100;
    }

    //检测响应选项的选择状态
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        print(component,row);
    }